ANATOMY
LYMPHATIC SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Only allergens create lifetime immunity.
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Viruses change quickly and frequently.
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Viruses do not create immune responses.
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Allergens mutate frequently.
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Detailed explanation-1: -Once B cells and T cells are formed, a few of those cells will multiply and provide “memory” for your immune system. This allows your immune system to respond faster and more efficiently the next time you are exposed to the same antigen.
Detailed explanation-2: -The major advantage to passive immunity is that protection is immediate, whereas active immunity takes time (usually several weeks) to develop. However, passive immunity lasts only for a few weeks or months. Only active immunity is long-lasting.
Detailed explanation-3: -What about those who haven’t been vaccinated? Another study6 in Qatar suggests that if the virus doesn’t change, infection-based immunity against reinfection can last up to three years. But that immunity can fade faster if the virus mutates.